Surveying and Levelling Instruments, Theoretically and Practically Described. / For construction, qualities, selection, preservation, adjustments, and uses; with other apparatus and appliances used by civil engineers and surveyors in the field.

by William Ford Stanley

[42] See Nicholson's Navigator's Assistant.

[43] Pearson's Practical Astronomy, p. 537.

[44] Ibid. p. 577.

[45] Gli Strumenti a Reflessione per Mesurare Angoli, by G. B. Magnaghi, 1875.

[46] Description of a New Quadrant, by George Adams, 1748.

[47] Adams' Geometrical Essays, edited by William Jones, 1803.

[48] Prov. Patent No. 2624; Christopher George, 1868.

[49] See British patents—Winter, 1760, No. 752; Ould, 1791, No. 1842; Nugent, 1794, No. 1980; Wright, 1796, No. 2081; Cook, 1796, No. 2087; Roxby, 1822, No. 4695; Glover, 1839, No. 8256; Lane, 1857, No. 1669; Rahill, 1860, No. 1845, etc.

[50] Adams' Geometrical Essays, p. 264, 1803.

[51] Proc. Inst. Civil Engineers, vol. xciii. part iii. paper No. 2308. See also Military Surveying in the Field, by Major The Hon. M. G. Talbot, Prof.; Papers Royal Engineers, vol. xiv. p. 25.